auto-fill-comment-rules: preference variable

Default value: 3

Bits in this variable let you customize how Epsilon breaks and fills
comment lines, in modes where Epsilon does this. The value 1 lets
Epsilon break an overlong comment line when you press <Enter>. The
value 2 lets Epsilon break an overlong comment line when you
insert any other character. The value 4 applies to C-style block
comments only, when Epsilon continues a comment line following one
that starts with /*. It tells Epsilon to create new lines with a
prefix of a single space, not a space, star, and space. The value
8 tells Epsilon not to merge adjacent block comments when filling,
as it does by default.